resource"random_shuffle""az"{input=["us-west-1a","us-west-1c","us-west-1d","us-west-1e"]result_count=2}resource"aws_elb""example"{# Place the ELB in any two of the given availability zones, selected# at random.availability_zones=["${random_shuffle.az.result}"]# ... and other aws_elb arguments ...}

result_count - (Optional) The number of results to return. Defaults to
the number of items in the input list. If fewer items are requested,
some elements will be excluded from the result. If more items are requested,
items will be repeated in the result but not more frequently than the number
of items in the input list.

seed - (Optional) Arbitrary string with which to seed the random number
generator, in order to produce less-volatile permutations of the list.
Important: Even with an identical seed, it is not guaranteed that the
same permutation will be produced across different versions of Terraform.
This argument causes the result to be less volatile, but not fixed for
all time.